I tried searching for this but not sure what terms I should use but was wondering if anyone has seen this issue and if so is there any adjustments that I can make to minimize it. What I am having issues with is when I am using sidescan from the console using my gt36 at the back of the boat and adding waypoints for brushpiles and other objects. When I go up to the front of the boat and get on my m360 I have another echomap ultra2 at the front of the boat networked and can see my waypoints but when I find the brush with m360 they are no where close to where the are on the map. Not sure that makes sense but it can be off by a good bit, never have really measured but its enough that I have to search around with the m360 to find the brush. I know with gps they are only accurate for a certain distance but it seems to be pretty far apart. I am getting good GPS lock so thats not the issue but maybe it's how I am marking the waypoints but something is not correct.

 

Has anyone seen this before and if so where you able to correct it and if so how. I have not called garmin support since most of the ones I talk to are just reading for the q&a guides from the website so I thought I would ask here first.

 

Thanks

All of the inputs that go into calculating a waypoint using side imaging have some error and when all the math is done those errors get multiplied.   If you’re consistently seeing errors over 50 feet then something is definitely off.  I’m using all Hummingbird stuff and I do see some inconsistencies but the brush pile is always within the 360 range.  
 

Are the position fixes of the two Garmin units constantly different?
 

19 minutes ago, Tennessee Boy said:

All of the inputs that go into calculating a waypoint using side imaging have some error and when all the math is done those errors get multiplied.   If you’re consistently seeing errors over 50 feet then something is definitely off.  I’m using all Hummingbird stuff and I do see some inconsistencies but the brush pile is always within the 360 range.  
 

Do the position fixes of the two Garmin units constantly different?
 

Ive never measured the distance its not 50ft but its not 10ft either. I need to take some measurements and see how far it really is but when I pull up on a waypoint its not showing up on m360 image. I have to search around, I need to play around with it some more and make some notes. The 2 Garmin units are networked and the waypoints appear to be in the same spot.

2 hours ago, bishoptf said:

Ive never measured the distance its not 50ft but its not 10ft either. I need to take some measurements and see how far it really is but when I pull up on a waypoint its not showing up on m360 image. I have to search around, I need to play around with it some more and make some notes. The 2 Garmin units are networked and the waypoints appear to be in the same spot.

 

But you're searching for the brush pile with the m360 that is on a HB unit correct? And once you find the brushpile and look at the HB map it's in a different spot vs the Garmin waypoint?

Just now, Junger said:

 

But you're searching for the brush pile with the m360 that is on a HB unit correct? And once you find the brushpile and look at the HB map it's in a different spot vs the Garmin waypoint?

Here's what happening, I am doing some side imaging, down imaging, 2d whatever and go over or beside some brushpiles, rock whatever. When I swing around and go back, I go up to the front of the boat, drop my tm in the water and steer towards my waypoints on the bow garmin.  I have range rings on my graphs for 80ft so there is a line that comes out and has dashes for each distance. I have the m360 set to 80ft also and it has range markers. So I pull up clearly in the range on my garmin map but brush is no where to be seen on my garmin unit, I have to go left/right etc and find what I marked on the map. Now how far it's off I never really figured it out but with the range rings being the same it should be within my range and I shouldn't have to search for it. At least that is my thinking, so again I need to go do more testing and see how far its really off.

 

 

I've found with my garmins there seems to be a bit of lag between position of the boat and showing it on the map. If I want to get very very accurate waypoints I have to just about stop over the top of the point for a few seconds and then mark it. Typically I'll mark a few and then come back and adjust to the precise spot if needed. 

3 minutes ago, Functional said:

I've found with my garmins there seems to be a bit of lag between position of the boat and showing it on the map. If I want to get very very accurate waypoints I have to just about stop over the top of the point for a few seconds and then mark it. Typically I'll mark a few and then come back and adjust to the precise spot if needed. 

Yeah kind of like the force tm that when you hit the spot lock if your moving your going to go backwards, lol. I need to see how much its really off but i've been noticing it. Just frustrating to spend the money and it kind of works, lol. 

Are both maps the same version? Same BIOS hardware version on the units? Just gotta start ruling stuff out. Also, contact Garmin, their customer support is excellent.

11 minutes ago, Junger said:

 

What unit is connected to the m360, and what map do you have on it. What map do you have on the Garmin.

 

What I'm alluding to is, HB and Garmin maps don't play well together. I have a Navionics map on my console Helix10, and I drop a WP, but when I go to my bow Helix10 that is using the HB base map, it's in a different spot.

I guess I wasn't clear, Hbird and Garmin are 2 separate units. I have  Helix 10 that has my m360 unit attached to it and dedicated to m360, thats all it does. I can change the m360 and do sidescan and mark way points but I have a Garmin echomap ultra2 on the console and one the bow networked. So when I am at the console and scanning I am marking objects on the Garmin at the console and since the 2 garmins are connected via networking the waypoints show up on my garmin unit on the bow, that is what I am using for maps, navigation, sidevu, clearvu, 2d etc. What I am saying is when I mark a waypoint and come up to it on my bow garmin map, its not in the 80ft range of the m360, I have to hunt around for the object.  Again I need to do some more testing and maybe since I am marking the waypoint from the console and the transducer is in the back of the boat PLUS the accuracy issue that maybe what I am seeing. I need to go out and spend some time testing and see how off it really is. 

 

What I haven't tried but what I bet would be the result is I could bring up mapping and sidescan on my m360 and throw a way point down and then split screen with map and m360 and from my prior experience with Hbird I bet it shows up close. But the transducer for m360 is at the front vs the back so something I just need to play with some more and figure out what I am doing wrong, lol.

Here's what I would do.

 

I would find something on the water that you can see on MEGA 360 and above the water.  I would pull up as close as possible to it and mark a waypoint with all of you fish finders.   I would then pull off of it a little and create a waypoint using 360.  Then I would drop a waypoint (or two) using side imaging.  Pull up the coordinates of all of these way points and record them somehow.   Go home and use one of the many online tools that will calculate the distance between coordinates.  Being a math geek I would probably graph them all on graph paper.  This will tell you the maximum distance between the two most distant waypoints.  I would hope they would all be within 15 feet but that might be a little optimistic.  

 

This actually sound fun.  I might have to try it myself. 😃

 

1 hour ago, bishoptf said:

Yeah kind of like the force tm that when you hit the spot lock if your moving your going to go backwards, lol. I need to see how much its really off but i've been noticing it. Just frustrating to spend the money and it kind of works, lol. 

Yes, this is exactly how I figured out to to handle my waypoints being off...my Force TM and spot lock lol. I agree with you. Still love my TM but I've debated on and off swapping the garmins for Hbirds to see the difference. 

15 minutes ago, Tennessee Boy said:

Here's what I would do.

 

I would find something on the water that you can see on MEGA 360 and above the water.  I would pull up as close as possible to it and mark a waypoint with all of you fish finders.   I would then pull off of it a little and create a waypoint using 360.  Then I would drop a waypoint (or two) using side imaging.  Pull up the coordinates of all of these way points and record them somehow.   Go home and use one of the many online tools that will calculate the distance between coordinates.  Being a math geek I would probably graph them all on graph paper.  This will tell you the maximum distance between the two most distant waypoints.  I would hope they would all be within 15 feet but that might be a little optimistic.  

 

This actually sound fun.  I might have to try it myself. 😃

 

I'm an electronic person and it just seems like its to much to ask that stuff just works these days. I think maybe what I will do is pull up to a buoy and mark that and then maybe go from there and see where things are in relation. The other thing I am going to do is have the bow use the GPS signal from the console, thats probably not helping and see if that changes anything. If I can get it to 10ft I am good with that but right now its more than 10ft.

8 minutes ago, Functional said:

Yes, this is exactly how I figured out to to handle my waypoints being off...my Force TM and spot lock lol. I agree with you. Still love my TM but I've debated on and off swapping the garmins for Hbirds to see the difference. 

The garmins seem like nice units, sidevu and clearvu is really sharp images, mapping seems to be accurate for the most part this is just one of the niggles I am seeing. In my old boat I only had hbird and there networking among the units, well it leaves a lot to be desired. I also thought by getting the garmin unit I could use it for mapping and if I want to add ffs down the road I would be setup for it and use the unit for mapping and ffs. I'll play around with it and see what I can figure out, I do not see many folks complaining about it so it's probably something with my setup, its hard to be on the water and play with electronics since I would rather be fishing.